I. GEOMETRICAL DRAWING. 17 



It contains 19 compasses and 11 accessory parts, 28 rules and scales, two of 

 the same with two keys for fortification drawing, eight triangles and set 

 squares, 10 protractors, two pantographs, and 52 other instruments. In all, 

 134 pieces. 



56. Case of Mathematical Instruments. 



Renaud Tachet, Paris. 



57. Proportional Compasses. Renaud Tachet, Paris. 



58. T-squares, Set Squares, and Curves. 



Renaud Tachct, Paris. 



59. Diagonal Scale. 



Geneva Association for the Construction of Scientific In- 

 struments. 



60. Scales made of Mica, for use in geometrical drawing. 



Max. Raphael, Breslau. 



275. Meter-measures, constructed of mica. 



Max. Raphael, Breslau. 



These measures have the advantage of being transparent, and may serve 

 for copying geometrical drawings. Owing to their remaining unaffected by 

 the ordinary changes of temperature they may also be used as standard 

 measures. 



61. Perspective Apparatus invented by James Watt. 



Bennet Woodcroft, F.R.S. 



62. Set of Mathematical Instruments, with all the 

 modern improvements : as used by professional draughtsmen, &c. ; 

 illustrated by diagrams of work performed. Win. Ford Stanley. 



62a. Magazine Case of Drawing Instruments. 



Henry Porter. 



64. Case of Mathematical Instruments, probably Dutch, 

 made at the beginning of the 18th century. Lewis Evans. 



65. Two Magazine Cases of Drawing Instruments. 



Mark Eames. 



65a. Large Magazine Case of Instruments. 



G. W. Strawson. 

 65b. Magazine Cases of Instruments (2). 



G. W. Strawson. 



65c. Morocco Case of Instruments. G. W. Strawson. 

 65d. Napier's Compasses (Electrum). G. W. Strawson. 



66. Beam Compass, T-squares, Set Squares, and 

 Curves. Bock and Handrick, Dresden. 



40075. B 



